I think that’s the single best piece of advice: constantly think about how you could be doing things better and questioning yourself.
释义:跟交情浅的朋友说过深的话题,是愚蠢的;生活贫困的人总是希望得到富贵者的施舍,是糊涂的;没有取得他人的信任就进献忠言,会被误解为批评。